Reported state-of-charge scaling

Patent metadata

Field	Value
Publication number	US-2016109529-A1
Application number	US-201514741262-A
Country	US
Kind code	A1
Filing date	Jun 16, 2015
Priority date	Oct 21, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

In a general aspect, a method can include providing an indication that the electronic device has changed from a battery charging state to a battery discharging state and measuring an initial measured state-of-charge (MSOC) value of a battery of the electronic device. In the event the initial MSOC value is above a threshold value, the method can further include determining a compensation value based on the initial MSOC value and the threshold value, determining an initial reported state of charge (RSOC) value by scaling the initial MSOC value using the compensation value and reporting the initial RSOC value using the electronic device.

First claim

What is claimed is:

1 . A method comprising:
determining, by an electronic device, that the electronic device has changed from a battery charging state to a battery discharging state; measuring, by the electronic device, an initial measured state-of-charge (MSOC) value of a battery of the electronic device; and in the event the initial MSOC value is above a threshold value:
determining a compensation value based on the initial MSOC value and the threshold value;
determining an initial reported state of charge (RSOC) value by scaling the initial MSOC value using the compensation value; and
reporting the initial RSOC value using the electronic device.

2 . The method of claim 1 , wherein the threshold value is a predetermined full-charge threshold value for the battery of the electronic device.

3 . The method of claim 1 , wherein the compensation value is a difference between the initial MSOC value and the threshold value.

4 . The method of claim 1 , wherein the initial RSOC value is a minimum value of:
a percentage value determined by the initial MSOC value divided by a sum of the threshold value and the compensation value; and one-hundred percent.

5 . The method of claim 1 , wherein the reporting the initial RSOC value includes displaying a percentage value corresponding with the initial RSOC value on a display of the electronic device.

6 . The method of claim 1 , further comprising:
detecting a decrease in a state-of-charge (SOC) of the battery from the initial MSOC value; and in response to the detecting:
measuring a changed MSOC value of the battery;
determining a modified RSOC value by scaling the changed MSOC value using the compensation value; and
reporting the modified RSOC value using the electronic device.

7 . The method of claim 6 , further comprising, prior to determining the modified RSOC value, amortizing the compensation value based on a predetermined range of MSOC values to produce an amortized compensation value, the determining of the modified RSOC value being based on the amortized compensation value.

8 . The method of claim 7 , wherein the decrease in the SOC is a first decrease, the changed MSOC value is a first changed MSOC value, the amortized compensation value is a first amortized compensation value, and the modified RSOC value is a first modified RSOC value, the method further comprising:
detecting a second decrease in a state-of-charge (SOC) of the battery from the first changed MSOC value; in response to the detecting the second decrease:
measuring a second changed MSOC value of the battery;
further amortizing the first amortized compensation value to determine a second amortized compensation value; and
in the event the second amortized compensation value is greater than zero:
determining a second modified RSOC value by scaling the second changed MSOC value using the second amortized compensation value; and
reporting the second modified RSOC value using the electronic device.

9 . A method comprising:
determining, by an electronic device, that the electronic device has changed from a battery discharging state to a battery charging state; measuring, by the electronic device, an initial measured state-of-charge (MSOC) value of a battery of the electronic device; determining whether a previously determined reported state of charge compensation value (RSOC_CV) of the electronic device is greater than zero; and in the event the previously determined RSOC_CV is greater than zero:
determining an initial reported state of charge (RSOC) value by scaling the initial MSOC value using the previously determined RSOC_CV; and
reporting the initial RSOC value using the electronic device.

10 . The method of claim 9 , wherein the initial RSOC value is a minimum value of:
a percentage value determined by the initial MSOC value divided by a sum of a full-charge threshold value of the electronic device and the previously determined RSOC_CV; and one-hundred percent.

11 . The method of claim 9 , wherein the reporting the initial RSOC value includes displaying a percentage value corresponding with the initial RSOC value on a display of the electronic device.

12 . The method of claim 9 , further comprising:
detecting an increase in a state-of-charge (SOC) of the battery from the initial MSOC value; and in response to the detecting:
measuring a changed MSOC value of the battery;
determining a modified RSOC value by scaling the changed MSOC value using the previously determined RSOC_CV; and
reporting the modified RSOC value using the electronic device.

13 . The method of claim 9 , further comprising:
detecting an increase in a state-of-charge (SOC) of the battery from the initial MSOC value; and in response to the detecting:
measuring a changed MSOC value of the battery;
amortizing the previously determined RSOC_CV to determine an amortized RSOC_CV, the amortizing being across a range of MSOC values determined by a difference between a full-charge threshold value and the initial MSOC value;
determining a modified RSOC value by scaling the changed MSOC value using the amortized RSOC CV; and
reporting the modified RSOC value using the electronic device.

14 . The method of claim 13 , wherein the increase in the SOC is a first increase in the SOC, the changed MSOC value is a first changed MSOC value, the amortized RSOC CV is a first amortized RSOC CV, and the modified RSOC value is a first modified RSOC value, the method further comprising:
detecting a second increase in a state-of-charge (SOC) of the battery from the first changed MSOC value; and in response to the detecting the second increase:
measuring a second changed MSOC value of the battery;
further amortizing the first amortized RSOC_CV to determine a second amortized RSOC_CV; and
in the event the second amortized RSOC_CV is greater than zero:
determining a second modified RSOC value by scaling the second changed MSOC value using the second amortized RSOC_CV; and
reporting the second modified RSOC value using the electronic device.

15 . An electronic device comprising:
a battery; a charging circuit; a battery fuel gauge operatively coupled with the battery and the charging circuit; at least one processor; and at least one non-transitory storage medium having instructions stored thereon, the instructions, when executed by the at least one processor, result in:
the battery fuel gauge receiving an indication that the electronic device has changed from a battery charging state to a battery discharging state;
measuring, by the battery fuel gauge, an initial measured state-of-charge (MSOC) value of the battery; and
in the event the initial MSOC value is above a threshold value, the instructions, when executed by the at least one processor, cause the battery fuel gauge to:
determine a compensation value based on the initial MSOC value and the threshold value;
determine an initial reported state of charge (RSOC) value by scaling the initial MSOC value using the compensation value; and
report the initial RSOC value on a display of the electronic device.

16 . The electronic device of claim 15 , wherein the instructions, when executed by the at least one processor, further cause the battery fuel gauge to:
detect a decrease in a state-of-charge (SOC) of the battery from the initial MSOC value; and in response to the detecting:
measure a changed MSOC value of the battery;
amortize the compensation value to determine an amortized compensation value, the amortizing being across a range of MSOC values;
determine a modi

Assignees

• Fairchild Semiconductor

Inventors

• Meacham James

Classifications

• H02J7/825

  Detection of fully charged condition · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• G01R31/367

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G01R31/371 Primary

  with remote indication, e.g. on external chargers · CPC title

• G01R35/005

  Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references (G01R33/0035, G01R35/002 take precedence) · CPC title